I have been using Reolink IP Cameras for a bunch of years. I installed 8 at our neighborhood pool and 2 at our house. I monitor all 10 with an app on my phone or by directly connecting to them in a web browser. All of these are wired.
Reolink makes WiFi cameras as well as a
4G Camera. I have not used the 4G camera, but I have used 3 different models of their wired cameras and they are great. Reolink has great customer service.
The IP cameras I use do not require a large amount of bandwidth. The 8 cameras at our neighborhood pool uses a neighbor's WiFi fed into a router using a Ubiquiti NanoStation. Usually the download speed is about 3 - 7 mbps at the router, so not that great, but it is enough for the 8 cameras.
The 4G camera is a little pricey and you would need to setup a data account for it. The camera only uses bandwidth if you are viewing the live stream. Since it is monitoring your dog, there wouldn't be a need for alerts (email or push), but the camera does support them.
-Michael